Patent US2827494A successfully refreshed from Google Patents.
US2827494A
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Preparation of ketals
Assignee: Dow Chemical Co
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Filing: 1956-03-08
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Granted: 1958-03-18
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Expires: 1976-03-08
Abstract
No abstract record available.
Inventors
- 👤 Jr John H Brown
- 👤 Nicholas B Lorette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:34
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR PREPARATION OF A LOWER KETAL BY THE REACTION OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF ETHANOL AND METHANOL AND A SATURATED ALIPHATIC KETONE HAVING FROM 3 TO 5 CARBON ATOMS AS REACTANTS, WHICH COMPRISES CONTACTING SAID REACTANTS WITH A CATION EXCHANGE RESIN IN THE ACID STATE AT A TEMPERATURE OF -40 TO 25*C. FOR A LENGTH OF TIME SUFFICIENT TO OBTAIN SUBSTANTIALLY EQUILIBRIUM CONDITIONS, AND RECOVERING THE KETAL.
Claim 2
Dependent Claim
73 words
A PROCESS FOR PREPARATION OF A LOWER KETAL BY THE REACTION OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF ETHANOL AND METHANOL AND A SATURATED ALIPHATIC KETONE HAVING FROM 3 TO 5 CARBON ATOMS AS REACTANTS, WHICH COMPRISES CONTACTING SAID REACTANTS WITH A CATION EXCHANGE RESIN IN THE ACID STATE AT A TEMPERATURE OF -40 TO 25*C. FOR A LENGTH OF TIME SUFFICIENT TO OBTAIN SUBSTANTIALLY EQUILIBRIUM CONDITIONS, AND RECOVERING THE KETAL.
References Cited (Backward Citations)
US2566559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |